package com.genesis.yunnanji.view;

import android.content.Context;
import android.content.res.TypedArray;  
import android.util.AttributeSet;  
import android.view.View;  
import android.view.ViewGroup;  
import android.widget.CompoundButton;  
import android.widget.LinearLayout;  
import android.widget.RadioButton;  
  
public class MyRadioGroup extends LinearLayout {  
    // holds the checked id; the selection is empty by default  
    private int mCheckedId = -1;  
    // tracks children radio buttons checked state  
    private CompoundButton.OnCheckedChangeListener mChildOnCheckedChangeListener;  
    // when true, mOnCheckedChangeListener discards events  
    private boolean mProtectFromCheckedChange = false;  
    private OnCheckedChangeListener mOnCheckedChangeListener;  
    private PassThroughHierarchyChangeListener mPassThroughListener;  
  
    public MyRadioGroup(Context context) {  
        super(context);  
        setOrientation(VERTICAL);  
        init();  
    }  
  
    public MyRadioGroup(Context context, AttributeSet attrs) {  
        super(context, attrs);  
        init();  
    }  
  
    private void init() {  
        mChildOnCheckedChangeListener = new CheckedStateTracker();  
        mPassThroughListener = new PassThroughHierarchyChangeListener();  
        super.setOnHierarchyChangeListener(mPassThroughListener);  
    }  
  
    @Override  
    public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) {  
        // the user listener is delegated to our pass-through listener  
        mPassThroughListener.mOnHierarchyChangeListener = listener;  
    }  
  
    @Override  
    protected void onFinishInflate() {  
        super.onFinishInflate();  
  
        // checks the appropriate radio button as requested in the XML file  
        if (mCheckedId != -1) {  
            mProtectFromCheckedChange = true;  
            setCheckedStateForView(mCheckedId, true);  
            mProtectFromCheckedChange = false;  
            setCheckedId(mCheckedId);  
        }  
    }  
  
    @Override  
    public void addView(View child, int index, ViewGroup.LayoutParams params) {  
        if (child instanceof RadioButton) {  
            final RadioButton button = (RadioButton) child;  
            if (button.isChecked()) {  
                mProtectFromCheckedChange = true;  
                if (mCheckedId != -1) {  
                    setCheckedStateForView(mCheckedId, false);  
                }  
                mProtectFromCheckedChange = false;  
                setCheckedId(button.getId());  
            }  
        } else if (child instanceof ViewGroup) {  
            int num = ((ViewGroup)child).getChildCount();  
            for (int i = 0; i < num; i++) {
                final RadioButton button = findRadioButton((ViewGroup) (((ViewGroup) child).getChildAt(i)));  
                if (button.isChecked()) {  
                    mProtectFromCheckedChange = true;  
                    if (mCheckedId != -1) {  
                        setCheckedStateForView(mCheckedId, false);  
                    }  
                    mProtectFromCheckedChange = false;  
                    setCheckedId(button.getId());  
                }  
            }  
              
        }  
  
        super.addView(child, index, params);  
    }  
  
    public RadioButton findRadioButton(ViewGroup group) {
          
        RadioButton resBtn = null;  
        int len = group.getChildCount();  
        for (int i = 0; i < len; i++) {  
            if (group.getChildAt(i) instanceof RadioButton) {  
                resBtn = (RadioButton) group.getChildAt(i);  
                break;  
            } else if (group.getChildAt(i) instanceof ViewGroup) {  
                resBtn = findRadioButton((ViewGroup) group.getChildAt(i));  
                break;  
            }  
        }  
        return resBtn;  
    }  
  
    /** 
     * <p> 
     * Sets the selection to the radio button whose identifier is passed in 
     * parameter. Using -1 as the selection identifier clears the selection; 
     * such an operation is equivalent to invoking {@link #clearCheck()}. 
     * </p> 
     *  
     * @param id 
     *            the unique id of the radio button to select in this group 
     *  
     * @see #getCheckedRadioButtonId() 
     * @see #clearCheck() 
     */  
    public void check(int id) {  
        // don't even bother  
        if (id != -1 && (id == mCheckedId)) {  
            return;  
        }  
  
        if (mCheckedId != -1) {  
            setCheckedStateForView(mCheckedId, false);  
        }  
  
        if (id != -1) {  
            setCheckedStateForView(id, true);  
        }  
  
        setCheckedId(id);  
    }  
  
    private void setCheckedId(int id) {  
        mCheckedId = id;  
        if (mOnCheckedChangeListener != null) {  
            mOnCheckedChangeListener.onCheckedChanged(this, mCheckedId);  
        }  
    }  
  
    private void setCheckedStateForView(int viewId, boolean checked) {  
        View checkedView = findViewById(viewId);  
        if (checkedView != null && checkedView instanceof RadioButton) {  
            ((RadioButton) checkedView).setChecked(checked);  
        }  
    }  
  
    /** 
     * <p> 
     * Returns the identifier of the selected radio button in this group. Upon 
     * empty selection, the returned value is -1. 
     * </p> 
     *  
     * @return the unique id of the selected radio button in this group 
     *  
     * @see #check(int) 
     * @see #clearCheck() 
     */  
    public int getCheckedRadioButtonId() {  
        return mCheckedId;  
    }  
  
    /** 
     * <p> 
     * Clears the selection. When the selection is cleared, no radio button in 
     * this group is selected and {@link #getCheckedRadioButtonId()} returns 
     * null. 
     * </p> 
     *  
     * @see #check(int) 
     * @see #getCheckedRadioButtonId() 
     */  
    public void clearCheck() {  
        check(-1);  
    }  
  
    /** 
     * <p> 
     * Register a callback to be invoked when the checked radio button changes 
     * in this group. 
     * </p> 
     *  
     * @param listener 
     *            the callback to call on checked state change 
     */  
    public void setOnCheckedChangeListener(OnCheckedChangeListener listener) {  
        mOnCheckedChangeListener = listener;  
    }  
  
    /** 
     * {@inheritDoc} 
     */  
    @Override  
    public LayoutParams generateLayoutParams(AttributeSet attrs) {  
        return new LayoutParams(getContext(), attrs);
    }  
  
    /** 
     * {@inheritDoc} 
     */  
    @Override  
    protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {  
        return p instanceof LayoutParams;
    }  
  
    @Override  
    protected LinearLayout.LayoutParams generateDefaultLayoutParams() {  
        return new LayoutParams(LayoutParams.WRAP_CONTENT,  
                LayoutParams.WRAP_CONTENT);  
    }  
  
    /** 
     * <p> 
     * This set of layout parameters defaults the width and the height of the 
     * children to {@link #WRAP_CONTENT} when they are not specified in the XML 
     * file. Otherwise, this class ussed the value read from the XML file. 
     * </p> 
     *  
     * <p> 
     * Attributes} for a list of all child view attributes that this class
     * supports. 
     * </p> 
     *  
     */  
    public static class LayoutParams extends LinearLayout.LayoutParams {  
        /** 
         * {@inheritDoc} 
         */  
        public LayoutParams(Context c, AttributeSet attrs) {  
            super(c, attrs);  
        }  
  
        /** 
         * {@inheritDoc} 
         */  
        public LayoutParams(int w, int h) {  
            super(w, h);  
        }  
  
        /** 
         * {@inheritDoc} 
         */  
        public LayoutParams(int w, int h, float initWeight) {  
            super(w, h, initWeight);  
        }  
  
        /** 
         * {@inheritDoc} 
         */  
        public LayoutParams(ViewGroup.LayoutParams p) {  
            super(p);  
        }  
  
        /** 
         * {@inheritDoc} 
         */  
        public LayoutParams(MarginLayoutParams source) {  
            super(source);  
        }  
  
        /** 
         * <p> 
         * Fixes the child's width to 
         * {@link ViewGroup.LayoutParams#WRAP_CONTENT} and the
         * child's height to 
         * {@link ViewGroup.LayoutParams#WRAP_CONTENT} when not
         * specified in the XML file. 
         * </p> 
         *  
         * @param a 
         *            the styled attributes set 
         * @param widthAttr 
         *            the width attribute to fetch 
         * @param heightAttr 
         *            the height attribute to fetch 
         */  
        @Override  
        protected void setBaseAttributes(TypedArray a, int widthAttr,  
                int heightAttr) {  
  
            if (a.hasValue(widthAttr)) {  
                width = a.getLayoutDimension(widthAttr, "layout_width");  
            } else {  
                width = WRAP_CONTENT;  
            }  
  
            if (a.hasValue(heightAttr)) {  
                height = a.getLayoutDimension(heightAttr, "layout_height");  
            } else {  
                height = WRAP_CONTENT;  
            }  
        }  
    }  
  
    /** 
     * <p> 
     * Interface definition for a callback to be invoked when the checked radio 
     * button changed in this group. 
     * </p> 
     */  
    public interface OnCheckedChangeListener {  
        /** 
         * <p> 
         * Called when the checked radio button has changed. When the selection 
         * is cleared, checkedId is -1. 
         * </p> 
         *  
         * @param group 
         *            the group in which the checked radio button has changed 
         * @param checkedId 
         *            the unique identifier of the newly checked radio button 
         */  
        public void onCheckedChanged(MyRadioGroup group, int checkedId);  
    }  
  
    private class CheckedStateTracker implements  
            CompoundButton.OnCheckedChangeListener {  
        public void onCheckedChanged(CompoundButton buttonView,  
                boolean isChecked) {  
            // prevents from infinite recursion  
            if (mProtectFromCheckedChange) {  
                return;  
            }  
  
            mProtectFromCheckedChange = true;  
            if (mCheckedId != -1) {  
                setCheckedStateForView(mCheckedId, false);  
            }  
            mProtectFromCheckedChange = false;  
  
            int id = buttonView.getId();  
            setCheckedId(id);  
        }  
    }  
  
    /** 
     * <p> 
     * A pass-through listener acts upon the events and dispatches them to 
     * another listener. This allows the table layout to set its own internal 
     * hierarchy change listener without preventing the user to setup his. 
     * </p> 
     */  
    private class PassThroughHierarchyChangeListener implements  
            OnHierarchyChangeListener {
        private OnHierarchyChangeListener mOnHierarchyChangeListener;
  
        public void onChildViewAdded(View parent, View child) {  
            if (parent == MyRadioGroup.this && child instanceof RadioButton) {  
                int id = child.getId();  
                // generates an id if it's missing  
                if (id == View.NO_ID) {  
                    id = child.hashCode();  
                    child.setId(id);  
                }  
                ((RadioButton) child)  
                        .setOnCheckedChangeListener(mChildOnCheckedChangeListener);  
            } else if (parent == MyRadioGroup.this  
                    && child instanceof ViewGroup) {  
                int num = ((ViewGroup)child).getChildCount();  
                for (int i = 0; i < num; i++) {//����Ҫѭ��  
                    RadioButton btn = findRadioButton((ViewGroup) (((ViewGroup) child).getChildAt(i)));  
                    int id = btn.getId();  
                    // generates an id if it's missing  
                    if (id == View.NO_ID) {  
                        id = btn.hashCode();  
                        btn.setId(id);  
                    }  
                    btn.setOnCheckedChangeListener(mChildOnCheckedChangeListener);  
                }  
                  
            }  
  
            if (mOnHierarchyChangeListener != null) {  
                mOnHierarchyChangeListener.onChildViewAdded(parent, child);  
            }  
        }  
  
        public void onChildViewRemoved(View parent, View child) {  
            if (parent == MyRadioGroup.this && child instanceof RadioButton) {  
                ((RadioButton) child).setOnCheckedChangeListener(null);  
            } else if (parent == MyRadioGroup.this  
                    && child instanceof ViewGroup) {  
                int num = ((ViewGroup)child).getChildCount();  
                for (int i = 0; i < num; i++) {//����Ҫѭ��  
                    findRadioButton((ViewGroup) (((ViewGroup) child).getChildAt(i))).setOnCheckedChangeListener(  
                            null);  
                }  
                  
            }  
            if (mOnHierarchyChangeListener != null) {  
                mOnHierarchyChangeListener.onChildViewRemoved(parent, child);  
            }  
        }  
    }  
} 